BUILD A ROCKET.

REACH ORBIT.

Assemble Falcon 9 Merlins, Raptor engines, and Starship tanks into a working rocket. Learn the physics behind every design decision — then launch it.

No account · Free · Open science

9,400

m/s to orbit

Δv required for LEO

311 s

Isp — Merlin 1D

Vacuum specific impulse

92,400 kN

33 × Raptor 3

Super Heavy thrust

◉

3D Rocket Builder

Drag and rotate a fully 3D rocket assembled from real SpaceX parts.

∑

Live Physics

Every part you add updates the Tsiolkovsky Δv equation in real time.

▶

Launch & Simulate

Watch a cinematic launch sequence with live telemetry charts.